Revert to old version of core?

I updated to the latest Nestopia core and unfortunately it seems to be broken. It fails to load (crashes the app) on any of my devices. Is it possible to revert to an older version of the core?

not without root and a backup of the older core. If you can get a logcat of the crash, we might be able to fix it.

http://pastebin.com/LJHkYu4K

There’s the log. I’m running Marshmallow, the 2016-11-01 RA nightly and the 2016-11-04 Nestopia core. Same thing occurs with any version of RA that’s up for download along with the 2016-11-04 Nestopia core. As soon as I try to load a game (through any method, either Load Core -> Load Content, Load Content and Detect Core, playlist, etc…) RetroArch crashes. Prior to the core update Nestopia worked fine with the same install.